There’s something even stranger about the bodies washing up in the river, all bright red and waxy. When the Doctor and Clara go missing, it’s up to Vastra, Jenny and Strax to rescue them before they too fall victim to the Crimson Horror!

Executive produced by Steven Moffat and Caroline Skinner

Directed by Saul Metzstein

Written by Mark Gatiss

Produced by Marcus Wilson

"Journey to the Centre of the Tardis" has been confirmed to air on BBC1 on Saturday 27 April 2013 at 6.30pm.